00195372-0102_AI_Vakuumpumpe_D1D2_DE EN - 第44页

2 Assembly instructi ons for vacuum pump D1 / D2 11/2006 Edition 44 2.9.2.2 Measure the vacuum with an external pre ssure measurement instrument: – at the meas uring conne ction of the va cuum distri bution blocks entran…

D1 / D2 2 Assembly instructions for vacuum pump

11/2006 Edition

: Carry out the function vacuum test.

The holding circuit vacuum test with closed nozzles can identify - contrary to when open - a devi-

ating value, if the vacuum plate exhibits an offset. Therefore, it is worthwhile carrying out the mea-

surement of the head and of the vacuum distribu

tor with the same measuring instrument. 2

The measured value must be nearly alike at all component heads and at the vacuum distribution

bloc

k. 2

Should more than a slight difference be given, then measure the vacuum with the

same portable

measuring instrument that you used for the vacuum distribution blocks also at all component

heads (to exclude possible offset fluctuations between the measuring plates). If a difference is

thereby identified, the leakage must be found and sealed. 2

Fig. 2.9.3 Example vacuum pickup circuit: listed measured values of all segments (closed with open and nozzles)

2 Assembly instructions for vacuum pump D1 / D2

11/2006 Edition

2.9.2.2 Measure the vacuum with an external pressure measurement instrument:

– at the measuring connection of the vacuum distribution blocks entrance (see Fig. 2.9.4) and

afterwards

– at an open nozzle in the holding circuit of the placement head (see Fig. 2.9.5). All other

nozzles must be closed.

Pressure may amount to max. 20-30 mbar! Otherwise everything is not sealed. 2

Fig. 2.9.4 Measurement of the vacuum distribution block (machine entrance)

: Remove for the plugs from the measuring connection at the vacuum distribution block.

: Attach the external measuring instrument.

: Switch the vacuum pump on.

: Open if necessary the inserted vacuum shut-off valves

: Open the compressed air shut-off valves.

: Switch the main switch on.

D1 / D2 2 Assembly instructions for vacuum pump

11/2006 Edition

: Note the measured value.

: Remove the measuring tube from the vacuum distribution block and put the plugs back in.

: Close all doors.

: Repeat the above with all attached mounting machines.

Fig. 2.9.5 Measuring a nozzle

: Press the gauge connecting piece of the external measuring instrument to the open nozzle.

If the values specified above are not reached, the cause

usually lies in a not correctly suspended

tube in the head area. Proceed as follows: 2

: Press all hoses down with

pliers.

: Repeat the vacuum measurement.

With closed nozzles with attached vacuum pump the vacuum is usually approx. 30-50 mbar

lower in the holding circuit than at a Venturi producer in the pickup circuit (in each case mea-

sured with external measuring instruments at an (open

) pipette in the pickup circuit and one (open)

in the holding circuit). 2

This difference can be accepted, if with 521 m NN (a

ltitude Munich, Start-up SIPLACE ) a value

800 mbar of at least is reached. 2